Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. On the Galapagos Islands, a ground finch that usually munched on small, soft seeds was forced, during a drought, to eat harder, larger ones. Within the space of a few generations, the bird evolved a larger but shorter beak better suited to cracking large seeds.
“I was especially interested in … how competitive interactions — competition for food — caused them to become much more different than they would otherwise have been,” Schluter said. “And this seems to be a common explanation for the diversity of forms.” This finding contradicted the received wisdom at the time that a new species would not arise if the existing population was still in contact and exchanging genes.
Great
Yes… finally tell the truth about the tree of life
We've come a long way from when we thought geese were fish.
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